Max Zs Values
Zs Values 18th Edition BS 7671
$8.99
3.1.16for iPhone, iPad and more
Age Rating
Max Zs Values Screenshots
About Max Zs Values
Calculate and look up the maximum permitted Zs value ( earth loop impedance ) to BS 7671. Max Zs Values also includes the 80% temperature adjusted values and a some MCCB 60947-2 manufacture Zs charts.
- 100% BS 7671 Zs Values
- 80% On Site Guide Zs Values
- Printable 60947-2 MCCB Zs Tables
- 0.4 (s) second disconnection times
- 0.2 (s) second disconnection times
- 5 (s) second disconnection times
> Common BS EN Devices:
Scroll through the list of protective devices and select the device rating to calculate the maximum permitted Zs value for your selected protective device and rating combination.
> 60947-2 MCCB's Zs Tables:
Look up the maximum permitted Zs tables for a selection of MCCB manufacture devices (some).
Maximum Zs Features:
+ Maximum Disconnection Times
+ BS 7671 18th Edition Zs Tables
+ Fuse's
+ MCB's
+ RCBO's
+ RCD's in TT earthing systems
+ Max REC Ze values
+ 100% values
+ 80% values
+ 0.4 second disconnection times
+ 0.2 second disconnection times
+ 5 second disconnection times
+ Uo 55v (U 110v) single phase and Uo 63.5v (three
phase) Zs values
+ BS EN 60947-2 MCCB manufacture device charts
(some)
There is now a new "Zs Converter" to convert old Zs values to the new 18th edition 230v Cmin Zs values.
A maximum Zs calculator for iPhone and iPad.
Check out our collection of electrical apps such as the "Pro Certs" Electrical Certification App for iPad.
- 100% BS 7671 Zs Values
- 80% On Site Guide Zs Values
- Printable 60947-2 MCCB Zs Tables
- 0.4 (s) second disconnection times
- 0.2 (s) second disconnection times
- 5 (s) second disconnection times
> Common BS EN Devices:
Scroll through the list of protective devices and select the device rating to calculate the maximum permitted Zs value for your selected protective device and rating combination.
> 60947-2 MCCB's Zs Tables:
Look up the maximum permitted Zs tables for a selection of MCCB manufacture devices (some).
Maximum Zs Features:
+ Maximum Disconnection Times
+ BS 7671 18th Edition Zs Tables
+ Fuse's
+ MCB's
+ RCBO's
+ RCD's in TT earthing systems
+ Max REC Ze values
+ 100% values
+ 80% values
+ 0.4 second disconnection times
+ 0.2 second disconnection times
+ 5 second disconnection times
+ Uo 55v (U 110v) single phase and Uo 63.5v (three
phase) Zs values
+ BS EN 60947-2 MCCB manufacture device charts
(some)
There is now a new "Zs Converter" to convert old Zs values to the new 18th edition 230v Cmin Zs values.
A maximum Zs calculator for iPhone and iPad.
Check out our collection of electrical apps such as the "Pro Certs" Electrical Certification App for iPad.
Show More
What's New in the Latest Version 3.1.16
Last updated on Feb 9, 2024
Old Versions
- Added Schneider TeSys MCCB max Zs table.
- New PDF viewer to fix the pinch/zoom/scroll bug when viewing PDF tables.
- A few UI improvements.
- New PDF viewer to fix the pinch/zoom/scroll bug when viewing PDF tables.
- A few UI improvements.
Show More
Version History
3.1.16
Feb 9, 2024
- Added Schneider TeSys MCCB max Zs table.
- New PDF viewer to fix the pinch/zoom/scroll bug when viewing PDF tables.
- A few UI improvements.
- New PDF viewer to fix the pinch/zoom/scroll bug when viewing PDF tables.
- A few UI improvements.
3.1.12
Aug 24, 2022
A few UI improvements and minor optimisations.
3.1.11
Aug 11, 2022
- Added a new "Zs Converter" to convert old Zs values to the 18th edition 230v Cmin Zs values.
- Added Wylex NHG MCCB Zs table.
- Added Wylex NHG MCCB Zs table.
3.1.10
Apr 5, 2022
Minor bug fixes.
3.1.9
Feb 1, 2022
Selection of "Device" bug fix and updated app icon.
3.1.8
Jan 23, 2022
Small bug fixes and some behind the scenes optimisations.
3.1.7
Aug 19, 2021
Added manufacture BS 3871 Type 4 max Zs values.
3.1.6
Feb 26, 2021
Added support for more screen sizes and made some layout improvements.
3.1.4
Dec 12, 2020
iOS update & some minor improvements.
3.1.3
Sep 24, 2020
Added: MCCB Explanation of Settings Symbols,
Added: DNO Ze Values & Earthing System Types Diagram,
Changed: Reference to REC changed to DNO / DSO.
Added: DNO Ze Values & Earthing System Types Diagram,
Changed: Reference to REC changed to DNO / DSO.
3.1.2
Apr 17, 2020
New and improved UI, printable 60974-2 MCCB charts, new integral document viewer.
3.1.1
Sep 6, 2019
V: 3.1.1 - 02/09/2019
> Added a print function to PDF charts.
> Added some more manufacture 60947-2 MCCB Zs charts.
> Reduced app size so it runs faster and takes up less storage space.
> Added a print function to PDF charts.
> Added some more manufacture 60947-2 MCCB Zs charts.
> Reduced app size so it runs faster and takes up less storage space.
3.1
Mar 10, 2019
Thank you for downloading Max Zs Values. This update brings new UI improvements and bug fixes. Your feedback is important to us, please email any improvement ideas to support@pro-certs.com or visit procertssoftware.com
3.0
Feb 1, 2019
New and improved 2019 version. BS 7671 18th edition update with improvements and extras.
2.1
Oct 1, 2015
V 2.0 - 27/09/2015: Updated Zs values for BS 7671 amendment 3 2015.
V 2.1 - 28/09/2015: Fixed share bug.
V 2.1 - 28/09/2015: Fixed share bug.
1.5
Oct 31, 2012
Database update of values
1.4
Oct 3, 2012
iOS 6 ready.
1.3
Jul 12, 2012
We have fixed a bug that when selecting any BS-88 devices , the results would not show.
Coming soon update for iOS 6
Coming soon update for iOS 6
1.2
May 3, 2012
An update to the main database and more protective devices added.
1.1
Feb 18, 2012
A New screenshot of the app is available when sharing with friends by email.
Share by Facebook and Twitter now go to the correct login page. We also made a few copy changes to the headings and some small tweaks. Enjoy and Thank you
Share by Facebook and Twitter now go to the correct login page. We also made a few copy changes to the headings and some small tweaks. Enjoy and Thank you
1.0
Feb 11, 2012
Max Zs Values FAQ
Click here to learn how to download Max Zs Values in restricted country or region.
Check the following list to see the minimum requirements of Max Zs Values.
iPhone
Requires iOS 11.0 or later.
iPad
Requires iPadOS 11.0 or later.
iPod touch
Requires iOS 11.0 or later.
Max Zs Values supports English
